fix: Fix HIR lowering of params of trait assoc fns - #23162
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It turns out they should be treated as bare idents, not patterns, but only if they have no body. Also allow macro patterns for both them and extern fns, because rustc allows that.
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It turns out they should be treated as bare idents, not patterns, but only if they have no body.
Also allow macro patterns for both them and extern fns, because rustc allows that.
Fixes #23155.